linux-kernel - Re: Suspected regression in "x86: extend e820 ealy

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Date:	Wed, 21 May 2008 18:43:59 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"kernel list" <linux-kernel@...r.kernel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: Suspected regression in "x86: extend e820 ealy_res support 32bit"

On Wed, May 21, 2008 at 4:23 PM, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> Yinghai Lu wrote:
>>
>> noticed that bootmap_size is shifted already...
>>
>> please use attached patch to see if bootmap is right...
>>
>
> Unfortunately its a bit difficult because printk() output isn't appearing at
> early boot (not sure why).  I'll try to extract something useful tomorrow.
>
> Perhaps this is helpful:
>
> This the e820 map of a regular boot:
>
> BIOS-provided physical RAM map:
> Xen: 0000000000000000 - 000000000009f000 (usable)
> Xen: 0000000000100000 - 0000000010000000 (usable)
> debug: ignoring loglevel setting.
> limit_regions start: 0000000000000000 - 000000000009f000 (usable)
> limit_regions start: 0000000000100000 - 0000000010000000 (usable)
> limit_regions endfunc: 0000000000000000 - 000000000009f000 (usable)
> limit_regions endfunc: 0000000000100000 - 0000000010000000 (usable)
> user-defined physical RAM map:
> user: 0000000000000000 - 000000000009f000 (usable)
> user: 0000000000100000 - 0000000010000000 (usable)
> 0MB HIGHMEM available.
> 256MB LOWMEM available.
> [...]
> Entering add_active_range(0, 0, 65536) 0 entries of 256 used
> Zone PFN ranges:
>  DMA             0 ->     4096
>  Normal       4096 ->    65536
>  HighMem     65536 ->    65536
> Movable zone start PFN for each node
> early_node_map[1] active PFN ranges
>   0:        0 ->    65536
> On node 0 totalpages: 65536
>  DMA zone: 56 pages used for memmap
>  DMA zone: 0 pages reserved
>  DMA zone: 4040 pages, LIFO batch:0
>  Normal zone: 840 pages used for memmap
>  Normal zone: 60600 pages, LIFO batch:15
>  HighMem zone: 0 pages used for memmap
>  Movable zone: 0 pages used for memmap
>
>

please check patch

http://lkml.org/lkml/2008/5/21/570

[PATCH] x86: extend e820 ealy_res support 32bit - fix

also please try to boot with
console=uart8250,io,0x3f8,115200n8
to get more early printout...

YH
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